GROUP ONE TRADING, L.P. Information

440 S. LASALLE STREET, CHICAGO, Illinois, 60605, (312) 347-8864

Report Date: 12/31/2013

Position Statistics

Total Positions 1,866
New Positions 491
Increased Positions 1,006
Decreased Positions 832
Positions with Activity 1,838
Sold Out Positions 408
Total Mkt Value (in $ millions) 905

Institutional Holdings information is filed by major institutions on form 13-F with the Securities and Exchange Commission.

Sector Weighting

Basic Materials 4.53%
Capital Goods 2.13%
Conglomerates 1.03%
Consumer Cyclical 2.68%
Consumer/Non-Cyclical 1.81%
Energy 15.12%
Financial 9.69%
Healthcare 13.61%
Services 21.24%
Technology 21.02%
Transportation 2.36%
Utilities 3.41%

1,866 Positions as of 12/31/2013

Company Class Value of Shares ($1,000s) ▼ Change in Value ($1,000s) Change (%) Shares Held
DOMTAR CORP COM NEW 81 81 New 847
CGG SPONSORED ADR 81 81 New 5,100
NORTHWEST PIPE CO COM 81 17 27.31 2,331
ARCH COAL INC COM 81 23 39.68 16,081
RHINO RESOURCE PARTNERS LP COM UNIT REPST 80 10 13.73 5,800
CAMBREX CORP COM 80 80 New 3,800
MARTHA STEWART LIVING OMNIMED CL A 80 78 4,826.47 20,100
CHAMBERS STR PPTYS COM 79 55 223.89 10,316
BRUKER CORP COM 79 79 New 3,750
EMERGE ENERGY SVCS LP COM REP PARTN 79 79 New 1,098
STARWOOD PPTY TR INC COM 79 -81 (50.73) 3,400
FRONTIER COMMUNICATIONS CORP COM 78 78 New 13,277
BALTIC TRADING LIMITED COM 78 8 10.69 12,134
NYMOX PHARMACEUTICAL CORP COM 78 17 27.47 15,417
QUALITY SYS INC COM 78 24 44.62 4,865
LEE ENTERPRISES INC COM 78 13 20.72 18,431
PERCEPTRON INC COM 77 77 New 6,421
UNIVERSAL INS HLDGS INC COM 77 34 79.42 5,702
CYNOSURE INC CL A 77 63 442.91 3,100
EDWARDS LIFESCIENCES CORP COM 76 -415 (84.47) 940